Maybe because it’s in the old livery, rather than a comment about the A350? It might even come back after a repaint? Or be replaced with an A321LR model. I wonder if Airbus provided one?

What are the chances that most Guests, or employees, would notice the model being an A321/330/350. How many would care? They would be far more likely to notify the “old plane”. The cabin of the A321LR appears to have been designed and branded by people who know what they are doing - hopefully the same team are ensuring the new branding is being consistently applied everywhere.